Backlight module for curved liquid crystal display device and curved liquid crystal display device

ABSTRACT

A backlight module for curved liquid crystal display device and a curved liquid crystal display device are disclosed. The backlight module comprises a backplate, a light guide plate and a backlight source that are arranged in the backplate, and quantum tubes that are arranged between the light guide plate and the backlight source, wherein a fold line which matches a curved surface of the curved liquid crystal display device is formed by the quantum tubes. In the backlight module according to the present disclosure, the fold line that is formed by the quantum tubes can be fitted into a curved line so as to match the curved surface of the curved liquid crystal display device. The quantum tubes can be applied to the curved liquid crystal display device through this arrangement, whereby the color purity of the curved liquid crystal display device can be improved, and the color gamut thereof can be enlarged.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims benefit of Chinese patent application CN201510304446.8, entitled “Backlight Module for Curved Liquid CrystalDisplay Device and Curved Liquid Crystal Display Device” and filed onJun. 4, 2015, the entirety of which is incorporated herein by reference.

FIELD OF THE INVENTION

The present disclosure relates to the technical field of liquid crystaldisplay device production, and particularly to a backlight module forcurved liquid crystal display device and a curved liquid crystal displaydevice.

BACKGROUND OF THE INVENTION

As one of the backlight technologies of high color gamut liquid crystaldisplay device, the quantum dot backlight technology has drawn more andmore attentions in recent years. In a liquid crystal display device witha quantum dot backlight source, a quantum tube is arranged in front of ablue Light-Emitting Diode (LED) light source. When blue light entersinto the quantum tube, the quantum dots which are packaged in thequantum tube can emit red light and green light after being excited bythe blue light. The red light and the green light, as well as part ofthe original blue light can mix into white light with high colorsaturation, which then enters into a light guide plate. In this case,the light with high color saturation can be provided to the liquidcrystal display device, and thus the color performance ability of thedisplay device can be improved. The color purity of the liquid crystalpanel can be improved by the quantum tube, while the color density ofthe color filter does not need to be intensified. Therefore, the powerconsumption of the liquid crystal panel would not be increased. Inaddition, the color gamut of the liquid crystal panel can be enlarged,with an extent of 30 percent for example.

FIG. 1 is a sectional view in a vertical direction of a quantum tube inthe prior art. FIG. 2 is a sectional view in a horizontal direction of aquantum tube in the prior art. As shown in FIG. 2, a quantum tube 10generally comprises a function part 13 which plays the role thereof andis arranged in a middle part thereof, and a package part 14 which wrapsthe function part 13. The function part 13 is generally made of amaterial of the quantum dots, and the package part 14 is generally madeof a glass material. In addition, it can be seen from FIG. 1 that, thequantum tube 10 comprises, along its longitudinal direction, aneffective area 11 which plays the role thereof and is arranged in amiddle part thereof, and a non-effective area 12 which is arranged atthe two sides.

When the liquid crystal display device has a curved surface, the quantumtube can hardly be used in the display device because of the rigidity ofthe quantum tube. In the prior art, the quantum dots are generallyarranged on the light source or other optical fiber materials, so thatthe color purity of the liquid crystal display device can be improved.However, the production of this kind of liquid crystal display device iscomplex, and the production cost thereof is relatively high. Moreover,the display effect of the whole display device is not satisfactory.

SUMMARY OF THE INVENTION

In order to solve the aforesaid technical problem in the prior art, thepresent disclosure provides a backlight module for curved liquid crystaldisplay device and a curved liquid crystal display device whichcomprises the backlight module. According to the backlight moduleprovided by the present disclosure, the quantum tube can be used in thecurved liquid crystal display device, so that the color performanceability and the color gamut of the curved liquid crystal display devicecan both be improved. Meanwhile, the manufacturing procedure of thebacklight module with this structure is simple, and the production costthereof is low.

According to a first aspect of the present disclosure, it provides abacklight module for curved liquid crystal display device, comprising: abackplate; a light guide plate and a backlight source that are arrangedin the backplate; and quantum tubes that are arranged between the lightguide plate and the backlight source, wherein a fold line which matchesa curved surface of the curved liquid crystal display device is formedby the quantum tubes.

Since the fold line is formed by the quantum tubes, the fold line can befitted into a curved line so as to match the curved surface of thecurved liquid crystal display device. Therefore, the quantum tubes canbe used in the curved liquid crystal display device through thisarrangement, whereby the color purity of the curved liquid crystaldisplay device can be improved, and the color gamut thereof can beenlarged. Meanwhile, the production of the backlight module can besimplified, and the production cost thereof can be reduced.

According to one embodiment, two adjacent quantum tubes are overlappedwith each other partly. Preferably, an effective area of one quantumtube of two adjacent quantum tubes extends to an effective area of theother quantum tube of the two adjacent quantum tubes. Through thisarrangement, the backlight source can correspond to the effective areaof the quantum tube. Therefore, with respect to a light-entering side ofthe light guide plate, a non-effective area of the quantum tube can beavoided.

According to one embodiment, grooves are arranged on a light-enteringside of the light guide plate, and configured to be a stepped shape thatmatches the fold line formed by the quantum tubes. The positions of thequantum tubes are defined by the light guide plate through thisarrangement. In this manner, the quantum tubes, which form a fold lineshape, are convenient to be installed, and the operation thereof issimple.

According to one embodiment, the grooves comprise one middle groove ortwo middle grooves, and side grooves that are arranged on two sides ofthe middle groove(s) respectively, bottom surfaces of the groovesdecreasing in sequence in a direction from the middle groove(s) to theside grooves. Through this arrangement, the grooves can be fitted intothe curved line which matches the curved surface of the curved liquidcrystal display device better. Meanwhile, the grooves with thisstructure are easy to be processed. In addition, with this arrangement,the positioning of the quantum tubes becomes more convenient to beperformed.

According to one embodiment, the side grooves are symmetrical about themiddle groove(s). The whole structure of the grooves can be simplified,and the manufacturing difficulty of the light guide plate can be reducedthrough this arrangement.

According to one embodiment, a bottom surface of each side groove isarranged to be an inclined surface which drops gradually in a directionfrom a middle part to two sides. The shape of the grooves can match thecurved surface of the curved liquid crystal display device betterthrough this arrangement.

According to one embodiment, the quantum tubes which match the sidegrooves at one side of the middle groove(s) are arranged in sequence ina same direction. Through this arrangement, the installation of thequantum tubes can be simplified, and thus the production cost thereofcan be reduced.

According to one embodiment, a length of each quantum tube ranges from 1cm to 20 cm. The quantum tubes can match the curved surface of thecurved liquid crystal display device better through this arrangement.

According to a second aspect of the present disclosure, it provides acurved liquid crystal display device, which comprises the aforesaidbacklight module.

Compared with the prior art, the following advantages can be broughtabout according to the present disclosure. In the backlight moduleaccording to the present disclosure, the fold line which matches thecurved surface of the curved liquid crystal display device is formed bythe quantum tubes, so that the technical problem in the prior art, i.e.,in the curved liquid crystal display device, the quantum dots should bearranged on the light source or other optical fiber materials only, canbe solved. In addition, the structure of the backlight module is simple,and the production cost thereof is low.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present disclosure will be illustratedin detail hereinafter with reference to the drawings. In the drawings:

FIG. 1 is a longitudinally sectional view of a quantum tube in the priorart;

FIG. 2 is a cross-sectional view of the quantum tube in the prior art;

FIG. 3 is a sectional view of a curved liquid crystal display deviceaccording to one embodiment of the present disclosure;

FIG. 4 schematically shows structures of a light guide plate and quantumtubes according to the embodiment of the present disclosure;

FIG. 5 is an enlarged diagram of area A of FIG. 4; and

FIG. 6 schematically shows a structure of a fold line formed by thequantum tubes according to the embodiment of the present disclosure.

In the drawings, a same component is represented by a same referencesign. The drawings are not drawn according to actual scale.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be further illustrated hereinafter withreference to the drawings.

FIG. 3 schematically shows a curved liquid crystal display device 200according to the present disclosure. As shown in FIG. 3 and FIG. 5, thecurved liquid crystal display device 200 comprises a backlight module100, which comprises a backplate 1, a light guide plate 2 and abacklight source 3 that are both arranged in the backplate 1, andquantum tubes 4 that are arranged between the light guide plate 2 andthe backlight source 3. Since the curved liquid crystal display device200 has a curved surface, a fold line can be formed through connectingthe quantum tubes 4 together so as to match the curved surface of thecurved liquid crystal display device 200, as shown in FIG. 6. It shouldbe noted that, the wording “connecting” is not limited by the case thatthe quantum tubes 4 are contacted with one another directly, but alsoincludes the case that the quantum tubes 4 can be combined into acertain shape without contacting one another.

Since the quantum tubes 4 each are made of rigid materials, one singlequantum tube 4 cannot be bent to conform to the curved surface of thecurved liquid crystal display device 200. The fold line formed throughconnecting the plurality of quantum tubes 4 together can be fitted intoa curved line so as to match the curved surface of the curved liquidcrystal display device 200. In this manner, the quantum tubes 4 can beapplied to the curved liquid crystal display device 200, whereby thecolor purity and color gamut of the curved liquid crystal display device200 can both be improved. Meanwhile, the structure of the curved liquidcrystal display device 200 is simple, and the production cost thereof islow.

According to the present disclosure, two adjacent quantum tubes 4 areoverlapped with each other partly. Preferably, an effective area 5 ofone quantum tube 4 of two adjacent quantum tubes 4 extends to aneffective area 5 of the other quantum tube 4 of the two adjacent quantumtubes 4. In this manner, a non-effective area 6 of one quantum tube 4can always overlap with the effective area 5 of another quantum tube 4,so that the backlight source 3 can correspond to the effective area 5 ofthe quantum tube 4. Therefore, the non-effective area 6 of the quantumtube 4 would not influence on the light-entering side of the light guideplate 2.

It should be noted that, the effective area 5 of one quantum tube 4 oftwo adjacent quantum tubes 4 does not have to extend to the effectivearea 5 of the other quantum tube 4 of the two adjacent quantum tubes 4necessarily, as shown in FIG. 5. In this case, the relative position ofthe backlight source 3 and the quantum tubes 4 should be optimized. Thatis, it should be ensured that the backlight source 3 can correspond tothe effective area 5 of the quantum tube 4.

As shown in FIG. 4, grooves 7 are arranged on the light-entering side ofthe light guide plate 2. The grooves 7 are configured to be a steppedshape, so as to define the positions of the quantum tubes 4 and matchthe fold line formed by the quantum tubes 4. The quantity of the grooves7 is equal to that of the quantum tubes 4. In this manner, the positionsof the quantum tubes 4 are defined by the light guide plate 2, so thatthe quantum tubes 4 are convenient to be installed, and the operationthereof is simple. In addition, with the stepped shape configuration ofthe light-entering side of the light guide plate 2, it can be guaranteedthat the quantum tubes 4 are overlapped with each other partly.Therefore, the non-effective area 6 of the quantum tube 4 would notinfluence on the light-entering side of the light guide plate 2.

As shown in FIG. 4, the grooves 7 comprise one middle groove 8 and sidegrooves 9 that are arranged on two sides of the middle groove 8. Thebottom surfaces of the grooves 7 decrease in sequence in a directionfrom the middle groove 8 to the side grooves 9. That is, the grooves 7are configured to be a stepped shape decreasing gradually in a directionfrom a middle part to two sides. Through this arrangement, the curvedline formed by the grooves 7 through curve fitting can match the curvedsurface of the curved liquid crystal display device 200 better.Meanwhile, the grooves 7 with this structure are easy to be processed.In addition, with this arrangement, the positioning of the quantum tubes4 becomes more convenient to be performed.

It should be noted that, the grooves 7 can also comprise two middlegrooves 8 and side grooves 9 that are arranged on two sides of themiddle grooves 8. The bottom surfaces of the grooves 7 decrease insequence in a direction from the middle grooves 8 to the side grooves 9.The two quantum tubes 4 corresponding to the two middle grooves 8 can bearranged opposite to each other. In this case, the non-effective areas 6of the quantum tubes 4 in the middle grooves 8 do not necessarilyoverlap with the effective area 5 of other quantum tube 4. Thus, theposition of the backlight source 3 shall be arranged in a reasonablemanner, so that the backlight source 3 does not correspond to thenon-effective area 6 of the quantum tube 4.

In order to reduce the manufacturing difficulty of the light guide plate2 and simplify the structure of the grooves 7, the side grooves 9 arearranged symmetrical about the middle groove(s) 8. Preferably, a bottomsurface of each side groove 9 is arranged to be an inclined surfacewhich drops gradually in a direction from a middle part to two sides.That is, the bottom surface of each side groove 9 is the inclinedsurface with one side near to the middle groove(s) 8 being higher andthe other side being lower. The whole shape of the grooves 7 can matchthe curved surface of the curved liquid crystal display device 200better through this arrangement.

It should be noted that, when there are two middle grooves 8, bottomsurfaces of the middle grooves 8 each can also be arranged to be aninclined surface which drops gradually in the direction from the middlepart to the two sides.

According to the present disclosure, as shown in FIG. 4, the quantumtubes 4 which match the side grooves 9 at one side of the middlegroove(s) 8 are arranged in sequence in a same direction. That is, thequantum tubes 4 at the left side of the middle groove(s) 8 are arrangedin sequence in a same direction. For example, the tip-shapednon-effective areas 6 of the quantum tubes 4 at the same side of themiddle groove(s) 8 face a same direction. Preferably, the quantum tubes4 are arranged symmetrical about the middle groove(s) 8. For example,the tip-shaped non-effective areas 6 of the quantum tubes 4 at the sameside of the middle groove(s) 8 extend outwards. Through thisarrangement, the installation of the quantum tubes 4 can be simplified,and thus the production cost thereof can be reduced. At the same time,the non-effective area 6 of the quantum tube 4 would not influence onthe light-entering side of the light guide plate.

In order to guarantee the display effect of the curved liquid crystaldisplay device 200, the fold line that is formed by the quantum tubes 4should match the curved surface of the curved liquid crystal displaydevice 200 closely. A length of each quantum tube 4 can range from 1 cmto 20 cm. In this case, the plurality of quantum tubes 4 with differentlengths or the same length can be arranged according to a size of thecurved liquid crystal display device 200, so that the quantum tubes 4can match the curved surface of the curved liquid crystal display device200 satisfactorily.

The curved liquid crystal display device 200 further comprises otherstructures and components, which are well known to those skilled in theart. The details of which are no longer repeated here.

The preferred embodiments of the present disclosure are statedhereinabove, but the protection scope of the present disclosure is notlimited by this. Any changes or substitutes readily conceivable forthose skilled in the art within the technical scope disclosed hereinshall be covered by the protection scope of the present disclosure.Therefore, the protection scope of the present disclosure shall bedetermined by the scope as defined in the claims.

The invention claimed is:
 1. A backlight module for curved liquidcrystal display device, comprising: a backplate; a light guide plate anda backlight source that are arranged in the backplate; and quantum tubesthat are arranged between the light guide plate and the backlightsource, wherein a fold line which matches a curved surface of the curvedliquid crystal display device is formed by the quantum tubes; andwherein two adjacent quantum tubes are overlapped with each otherpartly.
 2. The backlight module according to claim 1, wherein aneffective area of one quantum tube of two adjacent quantum tubes extendsto an effective area of the other quantum tube of the two adjacentquantum tubes.
 3. The backlight module according to claim 2, whereingrooves are arranged on a light-entering side of the light guide plate,and configured to be a stepped shape that matches the fold line formedby the quantum tubes.
 4. The backlight module according to claim 3,wherein the grooves comprise one middle groove or two middle grooves,and side grooves that are arranged on two sides of the middle groove(s)respectively, bottom surfaces of the grooves decreasing in sequence in adirection from the middle groove(s) to the side grooves.
 5. Thebacklight module according to claim 4, wherein the side grooves aresymmetrical about the middle groove(s).
 6. The backlight moduleaccording to claim 4, wherein a bottom surface of each side groove isarranged to be an inclined surface which drops gradually in a directionfrom a middle part to two sides.
 7. The backlight module according toclaim 6, wherein the quantum tubes which match the side grooves at oneside of the middle groove(s) are arranged in sequence in a samedirection.
 8. The backlight module according to claim 1, wherein alength of each quantum tube ranges from 1 cm to 20 cm.
 9. A curvedliquid crystal display device, comprising a backlight module, whichcomprises: a backplate; a light guide plate and a backlight source thatare arranged in the backplate; and quantum tubes that are arrangedbetween the light guide plate and the backlight source, wherein a foldline which matches a curved surface of the curved liquid crystal displaydevice is formed by the quantum tubes; wherein two adjacent quantumtubes are overlapped with each other partly.
 10. The curved liquidcrystal display device according to claim 9, wherein an effective areaof one quantum tube of two adjacent quantum tubes extends to aneffective area of the other quantum tube of the two adjacent quantumtubes.
 11. The curved liquid crystal display device according to claim10, wherein grooves are arranged on a light-entering side of the lightguide plate, and configured to be a stepped shape that matches the foldline formed by the quantum tubes.
 12. The curved liquid crystal displaydevice according to claim 11, wherein the grooves comprise one middlegroove or two middle grooves, and side grooves that are arranged on twosides of the middle groove(s) respectively, bottom surfaces of thegrooves decreasing in sequence in a direction from the middle groove(s)to the side grooves.
 13. The curved liquid crystal display deviceaccording to claim 12, wherein the side grooves are symmetrical aboutthe middle groove(s).
 14. The curved liquid crystal display deviceaccording to claim 12, wherein a bottom surface of each side groove isarranged to be an inclined surface which drops gradually in a directionfrom a middle part to two sides.
 15. The curved liquid crystal displaydevice according to claim 14, wherein the quantum tubes which match theside grooves at one side of the middle groove(s) are arranged insequence in a same direction.
 16. The curved liquid crystal displaydevice according to claim 9, wherein a length of each quantum tuberanges from 1 cm to 20 cm.